Deutschsland Uber Alles. (At least on the Continent, anyway.)
Yeah, and largely not even through the ambitions of the Germans themselves, so much as the failings of the Europeans to their west and south (However, the Poles, Czechs, Slovaks, Hugarians, and Croats aren't nearly as messed up as Old Europe, their time under Soviet domination was a long and instructive course in 'How not to do things').
Historical note, the War of 1870 was entirely provoked by France, which wanted to put the newborn German Empire under the Kingdom of Prussia in a solid second place in Continental Europe, under a pretext which was ridiculously contrived that it was on a level of the
casus belli of the Central American Soccer War. It did not work out as planned for France.